in 2003, the secret service revealed, president george w. bush received a letter containing a vial of ricin. no one was harmed in any of the cases. in this latest case, no word on anyone becoming sick. there is no indication this is tied to the boston terror scares. pierre thomas, abc news, washington. >> what is most important about the story, field tests are notoriously inaccurate. once again the potentially fatal powder, substance, ricin is now being sent, letter is being sent to a lab to make sure what they found perhaps is nothing or could be this particular -- >> more sophisticated tests. hopefully will conclude something else. right now does look like it could be. >> that's right. >>> claire mccaskill senator of missouri said the suspect in this case has been identified. they're familiar with this guy because he writes letters to lawmakers often. she won't say if there has been an arrest or anything like that. hopefully with any luck. get movement on the case fast. >> nobody said the two events would happen in boston and this mailing